Home / 30,939.63-42,707.75-18,364.38

Finding the Fourth Proportional to 30,939.63, 42,707.75 and 18,364.38

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Solution

The fourth proportional to 30,939.63, 42,707.75 and 18,364.38 is: 25,349.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,939.63 : 42,707.75 = 18,364.38 : x
  2. Step 2: Convert to fraction form
    30,939.63/42,707.75 = 18,364.38/x
  3. Step 3: Cross multiply
    30,939.63x = 42,707.75 × 18,364.38
  4. Step 4: Simplify right side
    30,939.63x = 784,301,349.95
  5. Step 5: Solve for x
    x = 784,301,349.95/30,939.63
  6. Step 6: Final answer
    x = 25,349.41

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.